What are the potential pitfalls of using isset() in PHP form handling?

One potential pitfall of using isset() in PHP form handling is that it only checks if a variable is set and not if it has a non-null value. This can lead to unexpected behavior if a form field is submitted with an empty value. To solve this issue, you can use the empty() function instead of isset() to check if a variable is set and has a non-empty value. 

if (!empty($_POST['username'])) {
    $username = $_POST['username'];
    // Process the username
} else {
    // Handle the case where the username is empty
}

Keywords

isset PHP form handling error handling validation

Related Questions